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- PDB-6po2: In situ structure of BTV RNA-dependent RNA polymerase in BTV core -
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Open data
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Basic information
Entry | Database: PDB / ID: 6po2 | ||||||||||||||||||||||||
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Title | In situ structure of BTV RNA-dependent RNA polymerase in BTV core | ||||||||||||||||||||||||
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![]() | VIRAL PROTEIN / TRANSFERASE / RNA dependent RNA polymerase | ||||||||||||||||||||||||
Function / homology | ![]() viral genome replication / RNA-directed RNA polymerase / RNA-dependent RNA polymerase activity / DNA-templated transcription / nucleotide binding / structural molecule activity / RNA binding Similarity search - Function | ||||||||||||||||||||||||
Biological species | ![]() | ||||||||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å | ||||||||||||||||||||||||
![]() | He, Y. / Shivakoti, S. / Ding, K. / Cui, Y. / Roy, P. / Zhou, Z.H. | ||||||||||||||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: In situ structures of RNA-dependent RNA polymerase inside bluetongue virus before and after uncoating. Authors: Yao He / Sakar Shivakoti / Ke Ding / Yanxiang Cui / Polly Roy / Z Hong Zhou / ![]() ![]() Abstract: Bluetongue virus (BTV), a major threat to livestock, is a multilayered, nonturreted member of the , a family of segmented dsRNA viruses characterized by endogenous RNA transcription through an RNA- ...Bluetongue virus (BTV), a major threat to livestock, is a multilayered, nonturreted member of the , a family of segmented dsRNA viruses characterized by endogenous RNA transcription through an RNA-dependent RNA polymerase (RdRp). To date, the structure of BTV RdRp has been unknown, limiting our mechanistic understanding of BTV transcription and hindering rational drug design effort targeting this essential enzyme. Here, we report the in situ structures of BTV RdRp VP1 in both the triple-layered virion and double-layered core, as determined by cryo-electron microscopy (cryoEM) and subparticle reconstruction. BTV RdRp has 2 unique motifs not found in other viral RdRps: a fingernail, attached to the conserved fingers subdomain, and a bundle of 3 helices: 1 from the palm subdomain and 2 from the N-terminal domain. BTV RdRp VP1 is anchored to the inner surface of the capsid shell via 5 asymmetrically arranged N termini of the inner capsid shell protein VP3A around the 5-fold axis. The structural changes of RdRp VP1 and associated capsid shell proteins between BTV virions and cores suggest that the detachment of the outer capsid proteins VP2 and VP5 during viral entry induces both global movements of the inner capsid shell and local conformational changes of the N-terminal latch helix (residues 34 to 51) of 1 inner capsid shell protein VP3A, priming RdRp VP1 within the capsid for transcription. Understanding this mechanism in BTV also provides general insights into RdRp activation and regulation during viral entry of other multilayered, nonturreted dsRNA viruses. | ||||||||||||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.7 MB | Display | ![]() |
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PDB format | ![]() | 1.4 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 20407MC ![]() 6pnsC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
#1: Protein | Mass: 149926.281 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#2: Protein | Mass: 103410.508 Da / Num. of mol.: 10 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Bluetongue virus 1 / Type: VIRUS / Entity ID: all / Source: NATURAL |
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Source (natural) | Organism: ![]() |
Details of virus | Empty: NO / Enveloped: NO / Isolate: SPECIES / Type: VIRION |
Buffer solution | pH: 8.8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: unspecified |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Cs: 2.7 mm |
Image recording | Electron dose: 32 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.14_3260: / Classification: refinement |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
Symmetry | Point symmetry: C1 (asymmetric) |
3D reconstruction | Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 150346 / Symmetry type: POINT |